Hedgedoc: Serve assets through HTTPS and not plain HTTP.

roles/hedgedoc/templates/docker-compose.yaml

@@ -13,6 +13,7 @@ services:
       - DB_PASS={{ hedgedoc_secrets['mysql_root_password'] }}
       - DB_NAME=hedgedoc
       - CMD_DOMAIN=hedgedoc.{{ domain }}
+      - CMD_PROTOCOL_USESSL=true
     ports:
       - {{ ports['hedgedoc'] }}:3000
     volumes: